Again, woods are very useful for making shelters! This time you need to find two trees in close proximity to each other and have some string handy and a plastic sheet.

Tie the string to a branch of each tree as if making a washing line, but low enough for your sheeting to reach over it and touch the ground at either side. Secure the sheet to the ground by using rocks to anchor it down at both sides.

If you are faced with one solitary tree, don't panic. Find a couple of thin branches and tie them together at one end, then open them apart and push the ends securely into the ground.

Run the string that is tied to the tree across to the two branches and over the top, then pull the string to the ground and weight it down with a rock. You can now drape the sheeting over the string and hold the sides down with more rocks.

Start building this shelter by making the end supports. Use two thin branches tied together as in the example above. You need a set for each end and then you want another branch for the cross section. After you have secured this branch at both ends, you have the basic frame.

Collect more branches and cut to a similar length, then begin to lay them at an angle against the cross branch. Push them firmly into the ground and secure each one at the top to the cross branch. Repeat this on the other side.

To fill the gaps you can use grass, bracken and anything else you can find. You could coat it in mud and clay also, but mud isn't waterproof.